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541757f34e
This use was not protecting any unportable code, it was just omitting the code because it wouldn't be used. Remove the use to reduce code complexity a bit. Discussion: https://www.postgresql.org/message-id/flat/54bde68c-d134-4eb8-5bd3-8af33b72a010@2ndquadrant.com
383 lines
8.3 KiB
C
383 lines
8.3 KiB
C
/*
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* psql - the PostgreSQL interactive terminal
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*
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* Copyright (c) 2000-2020, PostgreSQL Global Development Group
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*
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* src/bin/psql/prompt.c
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*/
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#include "postgres_fe.h"
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#ifdef WIN32
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#include <io.h>
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#include <win32.h>
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#endif
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#include "common.h"
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#include "common/string.h"
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#include "input.h"
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#include "prompt.h"
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#include "settings.h"
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/*--------------------------
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* get_prompt
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*
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* Returns a statically allocated prompt made by interpolating certain
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* tcsh style escape sequences into pset.vars "PROMPT1|2|3".
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* (might not be completely multibyte safe)
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*
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* Defined interpolations are:
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* %M - database server "hostname.domainname", "[local]" for AF_UNIX
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* sockets, "[local:/dir/name]" if not default
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* %m - like %M, but hostname only (before first dot), or always "[local]"
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* %p - backend pid
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* %> - database server port number
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* %n - database user name
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* %/ - current database
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* %~ - like %/ but "~" when database name equals user name
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* %w - whitespace of the same width as the most recent output of PROMPT1
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* %# - "#" if superuser, ">" otherwise
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* %R - in prompt1 normally =, or ^ if single line mode,
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* or a ! if session is not connected to a database;
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* in prompt2 -, *, ', or ";
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* in prompt3 nothing
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* %x - transaction status: empty, *, !, ? (unknown or no connection)
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* %l - The line number inside the current statement, starting from 1.
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* %? - the error code of the last query (not yet implemented)
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* %% - a percent sign
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*
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* %[0-9] - the character with the given decimal code
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* %0[0-7] - the character with the given octal code
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* %0x[0-9A-Fa-f] - the character with the given hexadecimal code
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*
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* %`command` - The result of executing command in /bin/sh with trailing
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* newline stripped.
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* %:name: - The value of the psql variable 'name'
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* (those will not be rescanned for more escape sequences!)
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*
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* %[ ... %] - tell readline that the contained text is invisible
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*
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* If the application-wide prompts become NULL somehow, the returned string
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* will be empty (not NULL!).
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*--------------------------
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*/
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char *
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get_prompt(promptStatus_t status, ConditionalStack cstack)
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{
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#define MAX_PROMPT_SIZE 256
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static char destination[MAX_PROMPT_SIZE + 1];
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char buf[MAX_PROMPT_SIZE + 1];
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bool esc = false;
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const char *p;
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const char *prompt_string = "? ";
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static size_t last_prompt1_width = 0;
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switch (status)
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{
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case PROMPT_READY:
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prompt_string = pset.prompt1;
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break;
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case PROMPT_CONTINUE:
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case PROMPT_SINGLEQUOTE:
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case PROMPT_DOUBLEQUOTE:
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case PROMPT_DOLLARQUOTE:
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case PROMPT_COMMENT:
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case PROMPT_PAREN:
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prompt_string = pset.prompt2;
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break;
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case PROMPT_COPY:
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prompt_string = pset.prompt3;
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break;
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}
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destination[0] = '\0';
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for (p = prompt_string;
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*p && strlen(destination) < sizeof(destination) - 1;
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p++)
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{
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memset(buf, 0, sizeof(buf));
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if (esc)
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{
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switch (*p)
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{
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/* Current database */
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case '/':
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if (pset.db)
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strlcpy(buf, PQdb(pset.db), sizeof(buf));
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break;
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case '~':
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if (pset.db)
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{
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const char *var;
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if (strcmp(PQdb(pset.db), PQuser(pset.db)) == 0 ||
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((var = getenv("PGDATABASE")) && strcmp(var, PQdb(pset.db)) == 0))
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strlcpy(buf, "~", sizeof(buf));
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else
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strlcpy(buf, PQdb(pset.db), sizeof(buf));
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}
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break;
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/* Whitespace of the same width as the last PROMPT1 */
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case 'w':
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if (pset.db)
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memset(buf, ' ',
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Min(last_prompt1_width, sizeof(buf) - 1));
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break;
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/* DB server hostname (long/short) */
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case 'M':
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case 'm':
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if (pset.db)
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{
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const char *host = PQhost(pset.db);
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/* INET socket */
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if (host && host[0] && !is_absolute_path(host))
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{
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strlcpy(buf, host, sizeof(buf));
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if (*p == 'm')
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buf[strcspn(buf, ".")] = '\0';
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}
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/* UNIX socket */
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else
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{
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if (!host
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|| strcmp(host, DEFAULT_PGSOCKET_DIR) == 0
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|| *p == 'm')
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strlcpy(buf, "[local]", sizeof(buf));
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else
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snprintf(buf, sizeof(buf), "[local:%s]", host);
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}
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}
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break;
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/* DB server port number */
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case '>':
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if (pset.db && PQport(pset.db))
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strlcpy(buf, PQport(pset.db), sizeof(buf));
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break;
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/* DB server user name */
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case 'n':
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if (pset.db)
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strlcpy(buf, session_username(), sizeof(buf));
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break;
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/* backend pid */
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case 'p':
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if (pset.db)
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{
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int pid = PQbackendPID(pset.db);
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if (pid)
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snprintf(buf, sizeof(buf), "%d", pid);
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}
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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*buf = (char) strtol(p, unconstify(char **, &p), 8);
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--p;
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break;
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case 'R':
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switch (status)
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{
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case PROMPT_READY:
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if (cstack != NULL && !conditional_active(cstack))
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buf[0] = '@';
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else if (!pset.db)
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buf[0] = '!';
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else if (!pset.singleline)
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buf[0] = '=';
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else
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buf[0] = '^';
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break;
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case PROMPT_CONTINUE:
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buf[0] = '-';
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break;
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case PROMPT_SINGLEQUOTE:
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buf[0] = '\'';
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break;
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case PROMPT_DOUBLEQUOTE:
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buf[0] = '"';
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break;
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case PROMPT_DOLLARQUOTE:
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buf[0] = '$';
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break;
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case PROMPT_COMMENT:
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buf[0] = '*';
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break;
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case PROMPT_PAREN:
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buf[0] = '(';
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break;
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default:
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buf[0] = '\0';
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break;
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}
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break;
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case 'x':
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if (!pset.db)
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buf[0] = '?';
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else
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switch (PQtransactionStatus(pset.db))
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{
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case PQTRANS_IDLE:
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buf[0] = '\0';
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break;
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case PQTRANS_ACTIVE:
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case PQTRANS_INTRANS:
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buf[0] = '*';
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break;
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case PQTRANS_INERROR:
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buf[0] = '!';
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break;
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default:
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buf[0] = '?';
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break;
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}
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break;
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case 'l':
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snprintf(buf, sizeof(buf), UINT64_FORMAT, pset.stmt_lineno);
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break;
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case '?':
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/* not here yet */
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break;
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case '#':
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if (is_superuser())
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buf[0] = '#';
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else
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buf[0] = '>';
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break;
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/* execute command */
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case '`':
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{
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int cmdend = strcspn(p + 1, "`");
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char *file = pnstrdup(p + 1, cmdend);
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FILE *fd = popen(file, "r");
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if (fd)
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{
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if (fgets(buf, sizeof(buf), fd) == NULL)
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buf[0] = '\0';
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pclose(fd);
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}
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/* strip trailing newline and carriage return */
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(void) pg_strip_crlf(buf);
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free(file);
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p += cmdend + 1;
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break;
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}
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/* interpolate variable */
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case ':':
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{
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int nameend = strcspn(p + 1, ":");
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char *name = pnstrdup(p + 1, nameend);
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const char *val;
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val = GetVariable(pset.vars, name);
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if (val)
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strlcpy(buf, val, sizeof(buf));
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free(name);
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p += nameend + 1;
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break;
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}
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case '[':
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case ']':
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#if defined(USE_READLINE) && defined(RL_PROMPT_START_IGNORE)
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/*
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* readline >=4.0 undocumented feature: non-printing
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* characters in prompt strings must be marked as such, in
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* order to properly display the line during editing.
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*/
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buf[0] = (*p == '[') ? RL_PROMPT_START_IGNORE : RL_PROMPT_END_IGNORE;
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buf[1] = '\0';
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#endif /* USE_READLINE */
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break;
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default:
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buf[0] = *p;
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buf[1] = '\0';
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break;
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}
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esc = false;
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}
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else if (*p == '%')
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esc = true;
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else
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{
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buf[0] = *p;
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buf[1] = '\0';
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esc = false;
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}
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if (!esc)
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strlcat(destination, buf, sizeof(destination));
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}
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/* Compute the visible width of PROMPT1, for PROMPT2's %w */
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if (prompt_string == pset.prompt1)
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{
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char *p = destination;
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char *end = p + strlen(p);
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bool visible = true;
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last_prompt1_width = 0;
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while (*p)
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{
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#if defined(USE_READLINE) && defined(RL_PROMPT_START_IGNORE)
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if (*p == RL_PROMPT_START_IGNORE)
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{
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visible = false;
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++p;
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}
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else if (*p == RL_PROMPT_END_IGNORE)
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{
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visible = true;
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++p;
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}
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else
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#endif
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{
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int chlen,
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chwidth;
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chlen = PQmblen(p, pset.encoding);
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if (p + chlen > end)
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break; /* Invalid string */
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if (visible)
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{
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chwidth = PQdsplen(p, pset.encoding);
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if (*p == '\n')
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last_prompt1_width = 0;
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else if (chwidth > 0)
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last_prompt1_width += chwidth;
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}
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p += chlen;
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}
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}
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}
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return destination;
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}
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